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Takahashi, Hiroyuki*; Kudo, Yusuke; Tsuchiya, Katsuhiko; Kizu, Kaname; Ando, Toshinari*; Matsukawa, Makoto; Tamai, Hiroshi; Miura, Yukitoshi
Fusion Engineering and Design, 81(8-14), p.1005 - 1011, 2006/02
Times Cited Count：2 Percentile：17.14(Nuclear Science & Technology)This paper presents dependence of the stress intensity factor, around the defect in the butt joint welding of a superconducting conductor conduit, on a geometrical factor estimated by fracture mechanics analysis. The stress intensity factor can be estimated by the Newman-Raju equation about CICC section, but the effect of the difference between the geometry assumed in the equation and CICC has not been clarified yet. Therefore, the three-dimensional finite element method (3D-FEM) is performed to estimate the geometrical factor. As a result, the Newman-Raju equation is considered to be available for the assessment of the fracture toughness of the conduit of rectangular shape because the maximum stress intensity factor by 3-D FEM is only 3% larger than that by the Newman-Raju equation in the maximum postulated defect.
Si investigated by ac calorimetryTateiwa, Naoyuki; Haga, Yoshinori; Matsuda, Tatsuma; Ikeda, Shugo; Yasuda, Takashi*; Takeuchi, Tetsuya*; Settai, Rikio*; Onuki, Yoshichika
Journal of the Physical Society of Japan, 74(7), p.1903 - 1906, 2005/07
Times Cited Count：71 Percentile：89.01(Physics, Multidisciplinary)The pressure dependences of the antiferromagnetic and superconducting transition temperatures have been investigated by ac heat capacity measurement under high pressures for the heavy-fermion superconductor CePt
Si without inversion symmetry in the tetragonal structure. The N
el temperature 
= 2.2 K decreases with increasing pressure and becomes zero at the critical pressure 
0.6 GPa. On the other hand, the superconducting phase exists in a wider pressure region from ambient pressure to about 1.5 GPa. The pressure phase diagram of CePtSi is thus very unique and has never been reported before for other heavy fermion superconductors.
-wave superconducting state of Sr
RuO
; A Microscopic determination of the gap structureNomura, Takuji
Journal of the Physical Society of Japan, 74(6), p.1818 - 1829, 2005/06
Times Cited Count：26 Percentile：73.56(Physics, Multidisciplinary)We provide a detailed quantitative analysis of transport properties in the -wave superconducting state of SrRuO. Specifically, we calculate ultrasound attenuation rate and electronic thermal conductivity within the mean field approximation. The momentum dependence of the gap function is determined by solving the Eliashberg equation for a three-band Hubbard model with the realistic electronic structure of SrRuO. Consequently, we obtain the temperature dependence of the transport coefficients in agreement with the experimental results.
Hamada, Kazuya; Koizumi, Norikiyo
Purazuma, Kaku Yugo Gakkai-Shi, 78(7), p.616 - 624, 2002/07
In the Tokamak type fusion reactor design, a forced flow superconducting coil is applied from the viewpoint to high magnetic field, high withstand voltage performance and large electromagnetic force. In the forced flow magnets, it is well known that various electromagnetic phenomena are occurred by zero resistance and diamagnetic effect of superconductor and complicated structure of cable in conduit conductor (CICC). In the R&D of CICC, the study of hysteresis losses and coupling losses CICC have a lot of progress. For example, using the optimization of filament arrangement in superconducting strand and control of contact resistance of strand, ITER model coil project have a large achievement.
Hamajima, Takataro*; Hanai, Satoshi*; Wachi, Yoshihiro*; Shimada, Mamoru*; Ono, Michitaka*; Martovetsky, N.*; Zbasnik, J.*; Moller, J.*; Takahashi, Yoshikazu; Matsui, Kunihiro; et al.
IEEE Transactions on Applied Superconductivity, 10(1), p.812 - 815, 2000/03
Times Cited Count：10 Percentile：53.49(Engineering, Electrical & Electronic)no abstracts in English
Sn cable-in-conduit conductors*; Ando, Toshinari; Nakajima, Hideo; Nishi, Masataka; Hiue, Hisaaki*; Yasukawa, Yukio*; Tsuji, Hiroshi
JAERI-M 93-065, 13 Pages, 1993/03
no abstracts in English
Tsukamoto, Hideo*; *; Koizumi, Norikiyo; Isono, Takaaki; Takahashi, Yoshikazu; Nishi, Masataka
JAERI-M 93-001, 25 Pages, 1993/02
no abstracts in English
Yoshida, Kiyoshi
JAERI-M 92-119, 148 Pages, 1992/08
no abstracts in English
Sn cable-in-conduit conductorsJ.R.Armstrong*
JAERI-M 92-013, 70 Pages, 1992/02
no abstracts in English
Nishi, Masataka; Ando, Toshinari; Isono, Takaaki; Sugimoto, Makoto; Koizumi, Norikiyo; Yoshida, Kiyoshi; Kawano, Katsumi; Takahashi, Yoshikazu; *; Tsuji, Hiroshi; et al.
IEEE Transactions on Magnetics, 28(1), p.597 - 600, 1992/01
Times Cited Count：5 Percentile：52.28(Engineering, Electrical & Electronic)no abstracts in English
